Well, we kind of know that the IF probably predates the Cûno-Inchoroi Wars, because something made Sirwitta into a gibbering mess. I also think that Nin’janjin sees it too, later, and this is what keeps him on the Inchoroi side.
I actually think the the IF indirectly corrupted Cu’jara Cinmoi, through Serwitta and Nin’janjin.